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68 www.xilinx.com PicoBlaze 8-bit Embedded Microcontroller
UG129 (v1.1.2) June 24, 2008
Chapter 9: PicoBlaze Development Tools
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Importing KCPSM3 Code into pBlazIDE
The pBlazIDE syntax and instruction mnemonics are different than the Xilinx KCPSM3
syntax. The pBlazIDE software provides an import function to convert KCPSM3 code to
the pBlazIDE syntax.
From the pBlazIDE menu, choose File Æ Import, then select the KCPSM3-format *.psm
file, as shown in Figure 9-3. The pBlazIDE software automatically translates and formats
the source code, as shown in Figure 9-4.
Figure 9-3: Converting Xilinx Syntax PicoBlaze Source Code to pBlazIDE Syntax
pBlaze IDE
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UG129_c10_03_051504
Figure 9-4: Example of How KCPSM Source Code Converts to pBlazIDE Code
CONSTANT myconstant, A5
NAMEREG s0, count16_lsb
NAMEREG s1, count16_msb
ADDRESS 000
main:
; initialize 16-bit counter, enable interrupts
LOAD count16_lsb, myconstant
ENABLE INTERRUPT
loop:
; continuously increment 16-bit counter
CALL increment_count
JUMP loop
end_main:
increment_count:
; add 1 to LSB of 16-bit counter
ADD count16_lsb, 01
; only add one to MSB if carry generated by LSB
ADDCY count16_msb, 00
RETURN
isr:
; decrement 16-bit counter by one on interrupt
; subtract 1 from LSB of 16-bit counter
SUB count16_lsb, 01
; only subtract one from MSB if borrow
; generated by LSB
SUBCY count16_msb, 00
RETURNI ENABLE
; interrupt vector is always in last memory location
ADDRESS 3FF
; jump to interrupt service routing (ISR)
JUMP isr
myconstant EQU $A5
count16_lsb EQU s0
count16_msb EQU s1
ORG 0
main:
; initialize 16-bit counter, enable interrupts
LOAD count16_lsb, myconstant
EINT
loop:
; continuously increment 16-bit counter
CALL increment_count
JUMP loop
end_main:
increment_count:
; add 1 to LSB of 16-bit counter
ADD count16_lsb, 1
; only add one to MSB if carry generated by LSB
ADDC count16_msb, 0
RET
isr:
; decrement 16-bit counter by one on interrupt
; subtract 1 from LSB of 16-bit counter
SUB count16_lsb, 1
; only subtract one from MSB if borrow
; generated by LSB
SUBC count16_msb, 0
RETI ENABLE
; interrupt vector is always in last memory location
ORG $3FF
; jump to interrupt service routing (ISR)
JUMP isr
KCMPSM Source Code Code Imported/Converted into pBlaze IDE
UG129_c10_04_052004